Pull-off mechanism for buttonhole-sewing machines



Feb. 12, 1924.; 1,483,185 M. MCCANN PULL-OFF MECHANISM FOR BUTTONHOLE SEWING MACHINES Filed Aug. 5. 1922 S Sheets -Sheet 1 Feb 12 W24; 1,483,185

M.MCANN PULL-OFF MECHANISM FOR BUTTONHOLE SEWING MACHINES Filed Aug. 1922 6 Sheets-Sheet 2 4 2 vi 111 y 1W o 1 I I iii 5 01 5?; -2

Fehm E924; L4835 M, M cANN PULL-OFF MECHANISM FOR BUTTQNHOLE SEWING MACHINES Filed Aug. 5. 1922 6 sheets shet 3 Feb. 12, 192%; K k43 M. MCCANN PULL-OFF MECHANISM FOR BUTTONHOLE SEWING MACHIN'ES Filed Aug. 1922 6 Sheets-Sheet;

Feb. 12 1924. 1,483,185 M. MCCANN PULL-OFF MECHANISM FOR BUTTONHOLE SEWING MACflINES Filed Aug. 5. 1922 6 Sheets-Sheet 5 Fe. 12. m4.

. M. M CANN PULL-OFF MECHANISM FOR BUl'TONHOLE SEWING MACHINES Filed Aug. 5. 1922 6 Sheets-Sheet s jlf Q2 7 Z M f 6 I p 9 s so Patented Feb. 12, 192%.

UNHFEF i,483,1&

MICHAEL MCCANN, OF GLENMORRIS, NEW YORK, ASSIGNOR TO FREDERICK OSANN COMPANY, OF NEW YORK, N, Y.,

A CQBPORATIQN OF NEW YORK.

PULL-OFF MECHANISM FOR BUTTONHOLE-SEWING MACHINES.

Application filed August 5, 1922. seriaino. 579,794.

To all whom it may concern:

Be it known that I MICHAEL MGCANN,

a citizen of the United States of America,

residing in Glenmorris, Long Island, in the 6 county of Queens and State of New York,

have invented certain new and useful Improvements in Pull-Off Mechanism for Buttonhole-Sewing Machines, of which the following is a true and exact description, reference being had to the accompanying drawings, which ,form a part thereof.

My invention relates to buttonhole sewing machines and particularly to the button hole sewing machines constructed in ac cordance with my co-pending applications for Letters Patent, Serial No. 325,710 filed 23 September 1919, and Serial No. 566,784, filed 8 June 1922, in which said pending applications the pull off mechanism which forms the subject matter of my present ap plication is shown in two diflerent modifications but not covered by the claims of either application. The object of my present invention is to provide mechanism for actuating a pull oif by means of which the pulling off of the thread will be accurately timed in relation to the operations performed by the machine in the completion of the button hole, that is to say, my improved mechanism insures, in the first place,

that the pull ofl shall occur in proper relation to the stopping of the machine; in the second place, that it shall occur in proper relation to the cutting ofi' of the threads at the completion of the button hole, and,

in the third place, that it shall occur in properly timed relationship to the cutting of the button hole.

The nature of my improvements will be best understood as described in connection with the drawings which illustrate the machine shown in my two said pending applications, and in which- I Figure 1 is a side elevation of the machine with the housing which encloses the lower part of the machine cut away so as to display the enclosed mechanism and the side plates of the housings enclosing the upper .part of the machine removed.

Figure 2 is a top view of the upper arm of the machine, showing the tension device and pull off supported upon the upper part of the machine.

F gure 3 is a plan view taken as on the section line 33 of Fig. 1.

Figure 4 is a sectional elevation on the line 44 of Fig. 1.

'Figure 5 is a sectional elevation on the hue 55 of Fig. 1.

Figure 6 is a plan View generally similar to Fig. 3, but showing the parts in the position they occupy immediately after the cutter actuating clutch is engaged.

Figure 7 is a side elevation taken substantially on the same line as Fig. 5, but showing the change in the position of certain of the parts which occurs when the cutter actuating clutch is engaged.

Figure 8 is a View generally similar to that of Fig. 7 but showing the parts in the position they occupy when the cutter is operated.

-Figure 9 is a plan view showing the-position of the parts immediately after the operation of the cutter.

Figure 10 is a similar view showing the position of 'the parts at the time that the pull oil is actuated and immediately before the stopping of the machine.

Figure 11 is a similar view showing the position of the parts after the stop shaft has been partly moved toward the left but has not yet been quite drawn to the position where the machine is again started in operation.

Figure 12 is a side elevation showing the belt shifting device and the bar to which the stop finger is attached.

Figure-13 is a detail side elevation showing the pivot bar and actuating cam by means of which the pull off is raised.

Figure 14'is a side elevation of the lever used for shifting the stop shaft.

Figure 15, a perspective view of a portion of the pull oil mechanism, and

Figure16, a perspective View of the coacting portion of the pull off device.

A indicates the housing of the lower part of the machine; A the vertical arm; A the horizontal arm, and A the head at the end of the horizontal arm. B is an opening formed through the top of the housing A.

C and C, cross ribs extendiilig down from the top of the housing A. is the mam drivin shaft of the machine and to the end extending through the housing is secured by any convenient means the disc D having, as shown, a hard steel wearmgface D and a stop recess indicated at D. 5 is a pulley fixed to the disc D, and D a pulle running loosely on the end of the shaft D" is an eccentric secured on the shaft D and connected by means of the eccentric rod E and lever E to the shaft E which, through connecting mechanism indicated at E gives a reciprocating movement to the needle bar E guided in the OSClllfltiIlg guideway Gr and carrying the needles indicated at E. D is a gear wheel secured on the shaft D and operating as will be described. D" is a cam secured on the shaft D through its hub D. D is an eccentric mechanism by which motion is given to the connecting rod I, and D is still another cam secured on the shaft D.

The gear wheel D drives, through a gear wheel F, a shaft indicated at F, having secured to its end a cam F.

G is a shaft secured in hearings in the upper arm of the machine and having at its left hand end an arm G which supports the guide Gr in which the needle bar moves. To the right hand end of the shaft G is secured the lever G having a curved lower end indicated at G, see Fig 4, and a guide slot formed in it, as indicitted at G. Through this curved lower end G and a guide block secured therein the lever G is connected with the lever H secured to the shaft H which, at its left hand end, carries a lever H connected so as to actuate longitudinally a shaft H to which are secured the loopers, such shaft and loopers being, by the mechanism described, caused to oscillate in synchronism with the necessary needles. Thenecessary angular oscillation of the shaft H is imparted to it through mechanism partly indicated at H but not shown in detail, as it forms no part of my present in-' vention.

I is a shaft to which an intermittent rotary motion is imparted by mechanism actuated by the shaft D. In this case, eccen trio mechanism D through an eccentric rod 1 and clutch I, engages and actuates the shaft I through the cam I, I indicating a" clutch on the other side of the said cam I by which it may be actuated by hand. The particular mechanism employed is not fully illustrated for the reason that it forms no part of my present invention. I is a cam secured to the shaft I, and I another cam secured to the same shaft. To the face of .the cam I is adjustably attached, as is clearly shown in'Fig. 5, finger I and in the opposite face of the disc is formed the cam recess indicated at I.

assesses through a cam roller K by the cam I as best shown in Fig. 4. To the free end of the lever K is connected the rod K through which motion is imparted to the pivot lever K, the connection between the said lever and the rod K being through a slot indicated at K, the lever K being pivoted at K, as indicated in Fig. 4. The free end of this lever carries pivotally attached to it, as indicated at K, two slide blocks, one movin in the slot Gr of the lever G and the ot er moving in a similar guideway in the oscillating block F having a forked lower end F by which it is engaged and actuated by the cam F and pivotally supported at F, see Fig. 1.

L is the cutter actuating shaft secured in the upper horizontal arm of the/machine connected, as indicated at L, with a knife carrying bar L, If, indicating the knife. To the shaft L is secured the lever arm L carrying the pin I1 through which and a link L, slidingly connected with the pin, connection is made with the in L attached to a slidin clutch member 8 supported on the shaft 2 and engageable with a fixed clutch member L attached to such shaft.

Referring now to the lower art of the machine, M is a longitudinal y movable shaft and to the end of this shaft, which projects through the right hand end of the casing A, is secured the forked arm M, one arm of which extends on the side of the hub D, and one arm of which carries the stop finger indicated at M Also secured to this end of the shaft is the belt shifter indicated at M arranged to engage and shift the belt indicated at m. M, M are buffers secured to the shaft M and form limit stops to its motion in both directions. To the left hand end of the shaft M i secured the arm M carrying at its end the knife M which cuts the threads below the work when the shaft completes its full longitudinal movement toward the right. M is a spring normally tending to move the shaft M toward the right and at M I have indicated the usual crank attachment by which the shaft is shifted toward the left on the starting of the machine. Pivoted on the shaft M is the arm N, from the upper side of which projects the latching pin N and which carries on its free end the plate indicated at N, which late is notched at the end, as indicated atsee Fig. 10. N i a bracket secured to this shaft and extending beneath the arm N, and N is a spring supported on this bracket and tending to push the arm N upward. O is a pivot pin on which is pivotally supported the latch preferably made, as shown, in the form of a bell crank lever with the spring 0 acting to turn it in a direction against the pin N.

P is a lever pivoted in the upright A at ,P and having a forkedupper end P which engages the "movable clutch member L. P

is a pin engaging perforation formed in the a lever P, the lower end of'whichlever is slotted, as indicated at P, to form a guideway for a slidin plate, to be described, and to this lower end of the lever is secured the pin P lying inoperative relationship to the cam disc P. P is a sliding late connected at its u per end to the pin 1" on the arm L and slic ing up and down in the guide -way formed between the ends P of the lever P, the lower end P of this bar when it is moved out to its lowermost position, extending beyond the end of the lever P. P is a spring which normally presses the upper end of the lever P towards the left.

12 is an arm secured to the right hand end of the shaft L and carrying at its end the tubular guide indicated at P in the face of which is located a spring P acting to push outward a pin indicated at P this pin being located so that, in the retracted position of the knife actuated by the shaft L and when the lever P is in the position shown in Fig. 1, the pin will engage in the hole P.

Q is a bar hinged on the shaft M and carrying on its free end ya plate Q with an angularly extend ng end indicated at Q which extends beneath the pull off rod indicated at Q. This rod is made adjustable in length, as by an adjusting sleeve indicated at Q, Fig. 1, and is normally pressed downward by a spring Q. To the top of the rod Q is secured'a thread engaging loop indicated at Q, and below this loop is secured a guide bar indicated at Q". The coacting pull off mechanism is best illustrated in Figs. 1 and 15, consisting of a clip 9 secured to the top of the machine, formed with downwardly extending hooks q, 9, etc. divided by slots indicated at f, the guide pin Q extending into the slot g so as to keep Q, in proper relationship to the hooks g. The threads indicated at g pass through the loop Q? and under the hook q. The plate Q is normally supported by an adjusting screw Q working in a bracket Q secured to the shaft M and is drawn downward against this adjustin screw by means of a down wardly exten ing pin Q, and the springQ, acting on the end of this pin, see Fig. 13. In Figs. 1 and 3, I have 'shown at R a lever pivoted at R having securedto it' a pin R ghich extends into the groove of the cam 12 at R is the slide R, moving in aguide mechanism indicated at R and carrying a Pivoted on the free end of this lever hook R at its end. This mechanism, while movable rod with a push button T at its left hand end and with its right hand end T engaged with the upper end of the lever P. This rod is normally pushed toward ,the left by a spring indicated at T but when ushed toward the right will push the lever toward the right and disengagethe clutch.

In normally operative position, that is, during the sewing of the button hole, the various parts of the machine are in the position shown in Figs. 1, 3, 5 and 13. Just before the stitching of the button hole is completed, the finger I", on the cam disc 1", comes in contact with the plate N of the locking bar N and presses it downward to the position shown in Fi 7, in which position it clears the ends of the lever P which have reviously been resting against its edge, as s own in Figs. 3 and 5, with the result that the s ring P pushes the upper end of the lever toward the left, carr ing with it the movable clutch member L w ich engages the fixed clutch member L". The lower forked end of the lever P now extends over the plate N The engagement of the clutch members, through the described mechanism connected with the movable clutch member, imparts motion to the cutter shaft L and forces the cutter L down through the goods to out the button hole, and, as the shaft L moves to actuate the cutter, the downward motion of the connected pin L forces downward the plate P, the end P of which presses the plate N further downward, as

shown in Fig. 8, carrying the latching pin N from the posit-ion shown in Fig. 7, in which it is still engaged with the latch O, to the position shown in Fig. 8, in. which it is disengaged from the latch, permitting the stop shaft M to move under the influence of its spring M toward the right This motion of the shaft, however, is arrested by the contact of the plate Q with the face of the cam D which results in the parts being brought to rest in the position shown in Fig. 9, in which they are held until the cam D in its rotation passes below the edge of the plate Q. whereupon the stop shaft and parts connected with it will again move toward the right, carrying the plate Q over the top of the cam D and permitting the stop finger M to contact with the friction surface D on the disc D and finally enter the stop recem D and arrest the motion of the machine simultaneously with the shifting of the belt M to the loose pulley, the final position of the parts at the time the machine is stopped being shown in plan in Fig. 10, in

which figure it will be observed the plate N has passed from beneath the ends P of the lever P on clearing which it will, of course, move upward under the influence of the spring N to its normal level in which its latchin pin N will be in position to be engaged by the latch O. Y

The upward movement imparted to the plate Q by the cam D is, through its extension Q imparted to the ull ofi' rod Q which, through the pull 0 mechanism described, efiects a pull off of the threads in nicely timed relation to the operation of the button hole cutter and of the thread cutter and, of course, in very nicely timed relation to the final action of'the stop motion described in arresting the motion of the machine. It will be understood that the action of the stop mechanism in arresting the motion of the machine is timed to occur just after the cutter L after cutting the button hole, has again returned to its uppermost and normal position of rest, in which the pin P carried by the arm P attached to the shaft L is in ali ment with the perforation P in the lever When it is desired to start the machine, the shaft M is drawn toward the left by the treadle lever M the parts being shown in intermediate position during this movement of the stop shaft in Fig. 11. This motion of the stop shaft, of course, withdraws the stop finger M from the stop recess D and.

carries with it the ivot arm N and attached plate N wh1ch contacts with the lower ends I of the lever P, drawin the pin P out of the recess 1 in cam disc I and, of course, turning the up r end of the lever P toward the right, ten s to draw the movable clutch member I) out of engagement with the clutch member L". This movement of the leverP also effects the entrance of the pin P into the hole P the result of which is to lock the shaft L in the position in which the cutter is in its uppermost position. The movement of the stop shaft also,of course, carries the plate Q toward the left until it clears the cam'D and amumes its'normal position of rest, as

shown in Fig. 13. As shown in Fig. 11, the

left hand motion of the shaft M through pin N presses the-latch lever O outward until on the completion of the motion of the shaft M the latch engages the pm, as shown in Fig. 3, and all of the operative parts are located in the position they occupy during the sewing of the button hole and until the finishing of the button hole cycle of operations described again occurs.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a button hole sewing machine havholding it in inoperative position, means messes I ing means for sto ping the machine as the button hole is finis ed, comprising and actuated by a longitudinally movable shaft and a spring acting to move the shaft in a direction to actuate the stop mechanism, the combination with said shaft of a latch normally holding it in inoperative position, means acting to release sa1d latch as the button hole nears completion, a bar pivoted on the stop shaft and moving with it, said bar, having a pull off actuating extension a rotating cam actuated by the driving shaft and located to register with and actuate the pivoted bar when the stop motion shaft is released from its latch, and a pull off device arranged to be actuated by the bar extension aforesaid.

2. In a button hole sewing machine having means for stopping the machine as the button hole is finished, comprising and actuated by a longitudinally movable shaft and a spring acting to move the shaft in a direction to actuate the stop mechanism, the combination with said shaft of a latch normally acting to release said latch as the button hole nears completion, a bar pivoted on the stop shaft and moving with it. said bar having a pull off actuatin extension, a rotating cam actuated by the riving shaft, said cam being located and shaped as described and so that when the stop shaft is released the pivoted bar will first come in contact with the side of said cam andarrest the movement of the sto shaft and then pass over and be engage by the face of said cam so as to be lifted as the stop shaft completes its motion to stop the machine and a pull off device arranged to be actuated by the bar extension aforesaid.

3. In a button hole sewing machine having means for stopping the machine as the button hole is finished comprisin and actuated by a longitudinally mova le shaft and a spring actlng to move the shaft in a 110 direction to actuate the stop mechanism,

a latch for holding the shaft in inoperative position, a button hole cutter, means for actuating said cutter operating as the button hole nears completion, means for releas- 115 ing the latch moving with the cutter, a bar pivoted on the stop'shaft and moving with it, said bar having a pull off actuating extension, a rotating cam actuated by the drivlatch for holding the shaft in inoperative position, a button hole cutter, means for actuating said cutter operating as the button hole nears completion, means for releasing the latch moving with the cutter, a bar pivoted on the stop shaft and moving with it said bar having a pull off actuating extension, a rotating cam actuated b the driving shaft, said cam being locate and shaped as described and so that when the stop shaft is released the pivoted bar will first come in contact with the side of said cam and arrest the movement of the stop shaft and then pass over andbe engaged by the face of said cam so as to be lifted as the stop shaft completes its motion to sto the machine, and a pull ofi device arranged to (l1 e actuated by the bar extension aforesal 5. In a button hole sewing machine having means for stopping the machine as vthe button hole is finished, comprising a friction disc with a stop recess secured to the driving shaft, a sprin actuated longitudinally movable stop sha having a stop finger positioned to contact with the friction disc and enter the recess when the shaft is released and a latch normally holding said shaft in retracted position, the combination therewith of a thread cutter moving with the sto shaft and acting to cut the thread when t e stop finger enters the stop recess in the disc, means for releasing the shaft latch as the button hole nears completion,

a bar pivoted on the stop shaft and mov-' ing with it having a ull 01f actuating extension, a cam actuated by the driving shaft and located to register w1th and actuate the pivoted bar when the stop shaft is released om its latch, and a pull ofi' device arranged to be actuated by the bar extension aforesaid.

6. In a button hole sewing machine having means for stoppin the machine as the button hole is fin1she comprising a friction disc with a stop recess secured to drivmg shaft, a sprmg actuated longitudinallymovable stop shaft having a stop finthe actuated by in the disc, means for releasing the shaft latchas the button hole nears completioii, a bar pivoted on the stop shaft and moving with it, said bar having a pull off actuating extension, a rotating cam actuated b the driving shaft, said cam being locate and shaped as described and so that when the stop shaft is released the pivoted bar will first come in contact with the side of said cam and arrest the movement of the stop shaft and then pass over and be engaged by the face of said cam so as to be lifted as the stop shaft completes its motion to stop the machine, and a pull off device arranged to be actuated by the bar extension aforesaid.

7. In a button hole sewing machine having means for stopping the machine as the button hole is finished, comprising a friction disc with a stop recess secured to the driv ing shaft, a spring actuated longitudinally movable stop shaft having a stop finger positioned to contact with the friction disc and enter the recess when the shaft is released and a latch normall holding said shaft in retracted position, t e combination therewith of a thread cutter moving with the sto shaft and acting to cut the thread when t e stop finger enters the stop recess in the disc, a button hole cutter, means for operating said cutter as the button hole nears completion, means for releasing the latch movin with the cutter, a bar ivoted on the sto s aft and moving with it aving a pull 0 actuating extension, a cam actuated by the driving shaft and located to register with and actuate the pivoted bar w en the stop shaft is released from its latch, and a ull ofi device arranged to be e bar extension aforesaid.

MICHAEL MOCANN. 

